Figure 17
The horizontal axis is labeled “T subscript cell, avg [degrees Celsius]”, ranging from 0 to 100 with an interval of 20. The left vertical axis is labeled “G subscript int [megapascal]”, ranging from 0 to 20 with an interval of 4, and the right vertical axis is labeled “f subscript 1, 4 P [Hertz]”, ranging from 68 to 74 with an interval of 2. A legend at the top lists “E V A (G subscript int versus T subscript cell, avg)”, “Exponential fit (G subscript int versus T subscript cell, avg)”, “Frequency (f subscript 1, 4 P versus T subscript cell, avg)”, and “Linear fit (f subscript 1, 4 P versus T subscript cell, avg)”. Triangular markers connected by a thin black line represent “E V A (G subscript int versus T subscript cell, avg)” starting near approximately 10 megapascal at 0 degrees Celsius, decreasing to about 6 megapascal near 20 degrees Celsius, then reducing further to around 2 megapascal near 45 to 50 degrees Celsius, followed by a drop to approximately 0.5 megapascal near 70 to 80 degrees Celsius, and approaching about 0.2 megapascal near 100 degrees Celsius. A thicker grey curve labeled “Exponential fit” follows these values, forming a smooth curve that decreases steeply from 0 to about 40 degrees Celsius and then gradually flattens toward the right side of the graph. Text near the lower left reads “ln (Y) equals 2.37 minus 0.038 X” and “R-squared equals 0.964221”. Circular markers represent “Frequency (f subscript 1, 4 P versus T subscript cell, avg)”. The values begin near approximately 73.9 Hertz around 20 degrees Celsius, decrease to about 72 to 73 Hertz near 30 degrees Celsius, then to around 70 to 71 Hertz near 40 degrees Celsius, and further decrease to about 69 Hertz near 45 degrees Celsius. A straight red line labeled “Linear fit (f subscript 1, 4 P versus T subscript cell, avg)” passes through these values, forming a uniform downward slope across the plotted range. Text near the center reads, “Y equals 77.24 minus 0.18 X” and “R-squared equals 0.969739”. Note: All numerical data values are approximated.Fundamental vibration frequency analysis for the examined point-supported BIPV floor (ABAQUS): variation of f1,4P (linear fit) as a function of the average temperature in the solar cells, Tcell,avg, and the shear modulus of the encapsulant, Gint. Source: Authors’ own work